AM60-AlN Nanocomposite and AM60 Alloy Corrosion Activity in Simulated Marine-Coastal Ambience

The initial stages of AM60-AlN nanocomposite and AM60 corrosion behaviors were compared over 30 days of exposure to solution (NaCl, Na2SO4 and NaHCO3), simulating the marine-coastal environment (SME). The incorporation of AlN nanoparticles (1.0 wt.%) in the AM60 alloy matrix favored the lower roughn...

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Bibliographic Details
Published inMetals (Basel ) Vol. 12; no. 12; p. 1997
Main Authors Chávez, Luis, Veleva, Lucien, Sánchez, Gerardo, Dieringa, Hajo
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.12.2022
Subjects
Aluminum compounds
Aluminum hydroxide
Aluminum nitride
Ambience
Chloride ions
Coastal environments
Corrosion and anti-corrosives
Corrosion currents
Corrosion potential
Corrosion products
Corrosion rate
Corrosion resistance
corrosion tests
Ductility
Electrochemical noise
Grain refinement
Grain size
Heat conductivity
Humidity
Localized corrosion
Magnesium alloys
Magnesium base alloys
magnesium-aluminum alloy
Manganese
nanocomposite
Nanocomposites
Nanoparticles
Random noise
simulated marine environment
Sodium bicarbonate
Specialty metals industry
XPS
Germany
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Summary:The initial stages of AM60-AlN nanocomposite and AM60 corrosion behaviors were compared over 30 days of exposure to solution (NaCl, Na2SO4 and NaHCO3), simulating the marine-coastal environment (SME). The incorporation of AlN nanoparticles (1.0 wt.%) in the AM60 alloy matrix favored the lower roughness of the AM60-AlN, associated with the grain refinement in the matrix. During the immersion of the alloys, pH of the SME solution shifted to alkaline values >9, and therefore, the solubility of AlN aluminum hydroxide phases were raised, followed by a slightly higher release of Mg-ions and corrosion rate increase. The chloride ions attributed to the unstability of the Al-Mn phase and Al(OH)3 corrosion product was formed in a low content. The composite AM60-AlN presented lower value of the electrochemical noise resistance (Rn), suggesting that the corrosion process occurs with less difficulty. The localized corrosion near the Al-Mn cathodes seems to be stronger on the composite surface, in area and depth of penetration. The corrosion current fluctuations suggested that the corrosion is a weakly persistent process, dominated by the fractional Gaussian noise (fGn).
ISSN:2075-4701
2075-4701
DOI:10.3390/met12121997